OPERATION
5
2.4
THREE STEP CHARGE ALGORITHM
See Figure 4. Battery charging is accomplished in three
automatic stages: BULK, ABSORPTION and FLOAT.
Figure 4: Three step charge system
BULK: At this stage the charger delivers its maximum
current for quick charging from 0 to 80%
ABSORPTION: The charger has reached its maximum
charge voltage and the charge current will slowly
decrease until the battery is charged up to 100%.
FLOAT: This stage begins once the battery is fully
charged. The battery remains in fully charged state.
By installing the battery temperature sensor the charge
voltages are automatically adapted for deviating
temperatures.
Figure 5: Temperature compensated charging
See Figure 5. When the battery temperature is low, the
charge voltage increases. On the other hand, when the
battery temperature is high, the charge voltage is
decreased. Over charge and gassing are prevented this
way. This will extend the life of your batteries
See also APPENDIX for detailed characteristics
of the three step Plus charge system.
2.5 MASTERBUS
(OPTIONAL)
The Chargemaster is compatible with the MasterBus
network: a fully decentralized data network for
communication between the different Mastervolt system
devices such as the inverter, battery charger, generator,
batteries and many more. See APPENDIX for details.
2.6 MAINTENANCE
No specific maintenance to the ChargeMaster is required.
Examine your electrical installation on a regular base, at
least once a year. Defects such as loose connections,
burnt wiring etc. must be corrected immediately.
If necessary, use a soft clean cloth to clean enclosure of
the ChargeMaster. Do not use any liquids or corrosive
substances, such as solvents, alcohol, petrol or abrasive
components.
2.7 FAILURES
The ChargeMaster is protected against overload, short
circuit, overheating and under and over voltage. If a fault
condition occurs, the POWER LED is blinking red and a
load bar segment on the display illuminates indicating the
failure cause.
CAUTION!
The ChargeMaster is not protected against:
reversed polarity on the DC-output,
over voltage on the AC-input.
12V
24V
battery temperature (
°
C)
charge voltage (V)
CHARGE CURRENT
BATTERY VOLTAGE
BULK
ABSORPTION
FLOAT
TIME
Red LED
Fault condition
Temperature error
Charger failure
Wrong AC voltage
Battery voltage too high
Battery voltage low, short circuit.
Charger output reduced to 25% of its
maximum
Load bar
